EXW Singapore — collect or forward from our Singapore office.

3G Electric
McDonnell & Miller Series AF1 Air Flow Switches
Mcdonnell & MillerFlow Switches

McDonnell & Miller Series AF1 Air Flow Switches

Note: listed by manufacturer as obsolete/discontinued.

SKU 3G-OTH-02748

Brand
Mcdonnell & Miller
Item
Series AF1 Air Flow Switches
Part Number
AF1
Category
Flow Switches
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support

Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Mcdonnell & Miller Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

Note: listed by manufacturer as obsolete/discontinued.

Frequently Asked Questions

What is the McDonnell & Miller AF1 flow switch used for?

The McDonnell & Miller AF1 flow switch is used for general purpose applications requiring medium and high velocity flow detection. It is designed for duct sizes of 8 inches (203 mm) minimum, or 6 inches (152 mm) if the paddle is trimmed. Typical uses include HVAC and industrial process systems.

What are the specifications of the McDonnell & Miller AF1 flow switch?

The AF1 flow switch features a brass paddle that fits a minimum duct size of 8 inches (203 mm), or 6 inches (152 mm) when trimmed. It is designed for medium and high velocity flow requirements. Note that the manufacturer lists this model as obsolete or discontinued.

Where to buy the McDonnell & Miller AF1 flow switch in Singapore?

3G Electric supplies the McDonnell & Miller AF1 flow switch to Singapore. We handle logistics, customs clearance, and delivery to your facility. Contact us for current availability and lead time, as this model is listed as discontinued by the manufacturer.

How to install the McDonnell & Miller AF1 flow switch?

Install the AF1 flow switch by mounting it in a duct with the paddle oriented perpendicular to flow. Ensure the minimum duct size is 8 inches (203 mm), or 6 inches (152 mm) if the paddle is trimmed. Follow standard electrical wiring practices for the switch contacts. Always consult the manufacturer's manual for safety guidelines.

Used in

Common applications for Mcdonnell & Miller
Boiler systems — McDonnell & Miller FS4-3T3-1 flow switch for low-water cutoff and pump protection in 1-inch piping.
Pump control — McDonnell & Miller FS8-W flow switch for detecting flow in 1-inch lines to prevent dry running.
HVAC cooling water — McDonnell & Miller FS6-3/4 flow switch for monitoring flow in 3/4-inch chilled water circuits.
Process piping — McDonnell & Miller FS5-3/4 brass flow switch for hot water applications up to 250°F.
Industrial liquid monitoring — McDonnell & Miller FS6-W-1 flow switch for 1-inch lines with high locked-rotor rating.
Small pipe systems — McDonnell & Miller FS-1 flow switch for 1/2-inch lines in liquid circuits requiring flow detection.
Not sure this is the right part? Photo-identify it→

Mcdonnell & Miller Products

3G Electric supplies Mcdonnell & Miller flow switches. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Related products

More from McDonnell & Miller

View all McDonnell & Miller parts →
In-line configuration eliminates need for a pipe tee High flow capacity 1 2 NPT Single pole, double throw snap switch Switch compartment is completely
McDonnell & Miller
In-line configuration eliminates need for a pipe tee High flow capacity 1 2 NPT Single pole, double throw snap switch Switch compartment is completely
In-line configuration eliminates need for a pipe tee Sizes available 3 4 NPT 1 NPT Paddles available for low, medium or high flow Two electrical
McDonnell & Miller
In-line configuration eliminates need for a pipe tee Sizes available 3 4 NPT 1 NPT Paddles available for low, medium or high flow Two electrical
For low velocity applications Paddle fits 8 (203mm) minimum duct size Two electrical knock-outs allow connection from either end Brass, steel and aluminum
McDonnell & Miller
For low velocity applications Paddle fits 8 (203mm) minimum duct size Two electrical knock-outs allow connection from either end Brass, steel and aluminum
For general purpose low velocity applications where the most economical flow switch is desired Paddle fits 8 (203mm) minimum duct size Two electrical
McDonnell & Miller
For general purpose low velocity applications where the most economical flow switch is desired Paddle fits 8 (203mm) minimum duct size Two electrical
1 1 4 NPT Brass with sealed tube construction Single pole, double throw snap switch Magnetic switching mechanism eliminates need for
McDonnell & Miller
1 1 4 NPT Brass with sealed tube construction Single pole, double throw snap switch Magnetic switching mechanism eliminates need for
1 NPT Two electrical knock-outs allows connection from either end Sensitivity adjusting screw makes flow adjustment easy Single pole, double throw snap
McDonnell & Miller
1 NPT Two electrical knock-outs allows connection from either end Sensitivity adjusting screw makes flow adjustment easy Single pole, double throw snap

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first